Swiftwick uses a 23.5-gauge Australian Merino Wool with 3-inch minimum staple length strands for its soft finish, no-itch feel, and durability. The most hydrophilic of all natural fibers, absorbing as much as 30 percent of its weight without feeling wet, Merino Wool has the ability to disperse electrostatic charge resulting in less lint and dirt collection on the sock. Our PURSUIT line of Merino compression socks are made in America and The Best Socks You Will Ever Wear - GUARANTEED. Merino wool won't let you down in any conditions, a natural wonder is wicks away sweat and insulates when you need it.